Darifenacin reduces muscle spasms of the bladder and urinary tract.

Darifenacin is used to treat symptoms of overactive bladder, such as frequent or urgent urination, and incontinence (urine leakage).

Darifenacin may also be used for other purposes not listed in this medication guide.

You should not use this medication if you are allergic to darifenacin, or if you have untreated or uncontrolled narrow-angle glaucoma, a blockage in your digestive tract (stomach or intestines), or if you are unable to urinate.

Before using darifenacin, tell your doctor if you have glaucoma, liver disease, a muscle disorder, ulcerative colitis, or a blockage in your stomach or intestines.

Avoid becoming overheated or dehydrated during exercise and in hot weather. Darifenacin can decrease perspiration and you may be more prone to heat stroke.

Darifenacin can cause side effects that may impair your vision or reactions. Be careful if you drive or do anything that requires you to be alert and able to see clearly.

There are many other medicines that can interact with darifenacin. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor. Keep a list with you of all the medicines you use and show this list to any doctor or other healthcare provider who treats you.

Stop using this medication and call your doctor if you have serious side effects such as hot and dry skin, extreme thirst, severe stomach pain or constipation, pain or burning when you urinate, or if you stop urinating.

You should not use this medication if you are allergic to darifenacin, or have certain conditions. Be sure your doctor knows if you have:

• untreated or uncontrolled narrow-angle glaucoma;

• a stomach disorder causing delayed emptying; or

• if you are unable to urinate.

Before using darifenacin, tell your doctor if you are allergic to any drugs, or if you have:

• glaucoma;

• liver disease;

• ulcerative colitis;

• a blockage in your stomach or intestines; or

• a muscle disorder such as myasthenia gravis.

If you have any of these conditions, you may need a dose adjustment or special tests to safely take darifenacin.

FDA pregnancy category C. This medication may be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment.

It is not known whether darifenacin passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.